Oh, and you get your posse to tell him that the "chat" is PRIVATE .. and if he tells your wife about it he'll regret it...
Have someone harass him with parking fines regularly too until you know he's leaving your wife alone...
He needs to KNOW he's being WATCHED... it will keep him AWAY...
Between your "posse" and OM wife I think you an keep your wife away from him...
If ANY of your friends at her workplace see them together talking have them BREAK the talk up.. just tell them to go over and say hello and to talk to the OM and to STEER him AWAY from your wife...
If OM knows EVERYONE around him is WATCHING him he will behave.. paranoia can work wonders.. you just need to stir his imagination up a bit so he knows how much of a thraet you are... right now he doen'st think you ARE a threat at ALL.. SHOW him you ARE.